Kim, Seon Joon Choi, Junghoon Maleski, Kathleen Hantanasirisakul, Kanit Jung, Hee-Tae Gogotsi, Yury Ahn, Chi Won 2024-01-19T19:04:42Z 2024-01-19T19:04:42Z 2021-09-05 2019-09-04 1944-8244 https://pubs.kist.re.kr/handle/201004/119589 MXenes are a prominent family of two-dimensional materials because of their metallic conductivity and abundant surface functionalities. Although MXenes have been extensively studied as bulk particles or free-standing films, thin and transparent films are needed for optical, optoelectronic, sensing, and other applications. In this study, we demonstrate a facile method to fabricate ultrathin (similar to 10 nm) Ti3C2Tx MXene films by an interfacial assembly technique. The self-assembling behavior of MXene flakes resulted in films with a high stacking order and strong plane- to-plane adherence, where optimal films of 10 nm thickness displayed a low sheet resistance of 310 Omega/square. By using surface tension, films were transferred onto various types of planar and curved substrates. Moreover, multiple films were consecutively transferred onto substrates from a single batch of solution, showing the efficient use of the material. When the films were utilized as gas sensing channels, a high signal-to-noise ratio, up to 320, was observed, where the gas response of films assembled from small MXene flakes was 10 times larger than that from large flakes. This work provides a facile and efficient method to allow MXenes to be further exploited for thin-film applications. English American Chemical Society TRANSPARENT TRANSITION THICKNESS MOS2 Interfacial Assembly of Ultrathin, Functional MXene Films Article 10.1021/acsami.9b12539 1 ACS Applied Materials & Interfaces, v.11, no.35, pp.32320 - 32327 ACS Applied Materials & Interfaces 11 35 32320 32327 scie scopus 000484831100081 2-s2.0-85071787357 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article TRANSPARENT TRANSITION THICKNESS MOS2 MXene interfacial self-assembly conformal transfer thin film gas sensor